Reliability assessment of reinforced concrete structures subjected to chloride-induced corrosion using a two-dimensional analytical model

초록

Corrosion of steel reinforcement is one of the major causes of deterioration of reinforced concrete structures. The cost of maintenance and repair of concrete structures damaged by corrosion is very high and that makes the prevention of corrosion very important. For this purpose, a numerical model for the reliability assessment of RC structures subjected to chloride-induced corrosion is proposed. To take into consideration easily the faster accumulation of chloride ions at the corner of rectangular members, and the randomness of the location of the reinforcement steel, a 2D analytical solution of Fick’s second law is employed. The corrosion initiation point is also defined and a numerical method for locating it is presented. A factor considering the effect of the corrosion initiation point on the corrosion rate is incorporated in the model. As an illustration, the proposed model is used to calculate the probability of corrosion initiation of a rectangular beam subjected to 2-D chloride ingress.